The ending confused me. I cannot figure which of these three things of happened:
1) Dr Brock received the innocent hand transplant and the end showed us that he was, in fact, a psychopath and it was never his hand controlling him,
2) Dr Brock was tricked into thinking he had the transplant, but he really did not, leaving him unknowingly having the serial killer hand as he lets his guard down around Chanel,
or
3) He received a hand transplant, but it was an even worse hand than he had before. The way Dr Cascade called it a "totally innocent hand" seemed suspicious.